Cylinder gauge



J, STARK CYLINDER GAUGE June 21, 1938.

Filed Feb. 4, 1936 i Patented June 21, 1938 John son-k, Chester, rs,magnolto Sun on Company, Philadelphia, Pa a corporation of New JerseyApplication Fehmry d, i936, Serial No. 82,256

3 Chums.

This invention relates to a recording gauge for gauging end recordingthe maximum and minimum internal diameters-of cylinders or tubes;

The gauge embodied in this inyention is especiclly s'dspted for gaugingthe maximum end minimum internal diameters of the tubes and .lt pulledthrough the tube being gauged. With such gauges the reading or recordwas taken from some device at the end of the handle which was operatedby rods or other connections from the gauge. With the long tubes nowused in such 29 stills the handle of the gauge must necessarily be verylong, thus not only making the gauge unwieldy, but also seriouslyimpairing its accuracy.

It is therefore an object of this invention to provide an internalcylinder or tube gauge which 25 may be wholly inserted in the cylinderor tube'to be gauged and with which acontinuous record irom end to endof the tube of maximum and minimum internal diameters may be made, di=-rectly on the gauge without the necessity of long 30 connections fromthe gauge to the end of the tube, except for a cord used to draw thegauge through the tube.

Referring now to the drawing which forms it part of this specification,and in which like num- 35 hers refer to like parts throughout:

Fig. lie s. iongitudinal'section of the preferred form of thisinvention,

Fig. 2 is e section taken on the line 2-2 of Fig. 1, end 40 his. 3 is c.section taken on the line t-3 of Fig. 1.

in the drawing, the body of the gauge consists of s tube 8, within whichtwo sleeves lid and lb ere siidobly mounted. These sleeves to and it erepressed outwardly, by s spring 23, against the centrulimng erms d whichextend through openings in the tube 6. These centre-lining arm are inthe form of is hell crank, end are fastened by pins t to redisiiyextending lugs i on'collsrs to end n so welded to time i. Preferablythee such centrelising arms 5, spaced equidistsntly about tube i erestteched to eeeh of the callers its and. so. The outer ere: of each ofthe centralizing srms t is i'orhed suds wheel or sliding shoe t is ice-55 tened thereto by P .7

A recording arm holder in the form of a collar i2 is welded to tube ibetween the collars do and till, end recording arms it are fastened toradially extending lugs 03 on collar it by pins it. There are preferablythree recording srms it spaced 5 eeuidistantly around tube 6. A wheel orslidin shoe it is isstened to each recording arm it by pin ii. A springit, fastened to tube 5 or collar i3, presses each recording arm itoutwardly with its tell its. normally resting against tube i. A pencillead or other suitable stylus iii is held in the outer end of an arm 2'?pivoted at ii to each recording arm it and may be adjusted radially bymeans of. set screw it.

A collar 26 is slidabiy mounted on tube i between the outer end ofrecording arm it and collar 8b. Collar 21 is fixedly fastened to wireloop 22 which passes through guide holes in collars 8c and 8b andrecording arm holder it. A disk 23 is rotatably'mounted on collar 2!,being held thereon by a split ring 24. A series of equally spacedratchet teeth M are machined on the collar 2|. Ratchet pawl 25 on disk23, pressed by spring 26, engages ratchet teeth ti on collar 2i andprevents rotation of disk 23. A disk of paper 25 28maybeinsertedinaninsetindisktlandbe held in place by said split ring.

The disk 28 is pushed back until it is not in contact with pencil pointis. Ratchet pawl 25 is then pulled back and the disk 23 is rotated 30until unmarked portions of paper 21 are opposite the recording arms it,ratchet pawl 25 is then released locking disk to in place. A wire orother means for pulling the gauge through the tube is then passedthrough the tube A and fastened to the wire loop 22. The entire gauge isthen inserted in the tube A, cure being taken not to pull the wire loop22 and thus pull dish 2% against the pencil point it. When the gauge hasbeen inserted in the tube is, the centralizing arms being pushedoutwardly by spring 3, "will center the gauze or tube i in tube A, thewheels on centrslimng srms ii bearing against the wells of the tube A.The recordingerms it are pressed outwardly by springs it and wheels iton srms e5 it bear against the wells of tube A. The gauge is then pulledthrough the tube being gauged by the wire attached to wire loop 32.Pulling wire loop 22 draws the collar 25 along the tube i until disk 23is in cbntsct with pencil points it. its so the gauge is drawn throughthe tube A, the wheels it on recording srms it follow the contour of thewells of the tube, so that may veristions in the internal diameter ofthe tube is recorded ,on the peper it by the pencil s5 points l9. Beforethe gauge is withdrawn from the tube, the wire loop 22 should be pushedback, thus moving disk 23 away from pencil point IS. The gauge is thenwithdrawn from the tube A and the maximum and minimum internal diameterof the tube A may then be read on paper disk 28. Ratchet pawl 25 maythen be drawn back and the disk 28 rotated one notch, thus bringing aclean part of paper disk 28 opposite the pencil point IS. The gauge maythen be used to gauge another tube in the manner described above. WhileI have herein shown and described a preferred embodiment of myinvention, it is apparent that. various changes and modifications may bemade therein without departing from the spirit of my invention or thescope of the ap-- pended claims.

Having now described my invention, what I in a radial directiontherefrom, means for apply-- lng uniform outward pressure to saidcentering arms, recording arms pivoted on said gauge body and havingtheir outer ends free to move in a radia1 direction therefrom, means forapplying outward pressure to said recording arms, a recording surfacecarried by said gauge body and movable longitudinally therealong, meansfor drawing said gauge body through the cylinder to be gauged, said lastnamed means being operable to first move said recording surfacelongitudinally along said gauge body into contact with said recordingarms and then to move the gauge longitudinally through the cylinderwhereby, during said movement of the gauge, said recording surfacerecords radial movements of said recording arms.

2. A gauge for measuring the maximum and minimum internal diameters ofcylinders, which comprises a gauge body, gauge-centering means carriedby the gauge body comprising two series of wheels movable longitudinallyalong the inner wall of the cylinder being gauged, a recording device,positioned between said centering means, which is movable longitudinallywith the gauge body and which comprises cooperating devices one of whichis adapted in such longitudinal movement to follow the contour of thecylinder wall and the other of which has a limited longitudinal movementrelative to the gauge body to enable it to be brought into operatingrelation with the first named device.

3. A gauge for measuring the maximum and minimum internal diameters ofcylinders which comprises a gauge body, centering means carried therebyand adapted to engage the internal wall of the cylinder and to be rolledlongitudinally therealong, a recording device, carried by the gaugebody, comprising cooperating devices, movable longitudinally with thegauge body, one of which comprises a radially movable element adapted inits longitudinal movement to follow the contour of the cylinder wall anda marker movable radially with said element and the other of which is anannular disc having a recording surface and being longitudinally movablerelative to the gauge body into operative relation with the marker, andmanually operative means which is operable to first impart to said discthe relative longitudinal movement specified and to then longitudinallymove the gauge and both of said cooperating devices in unison.

JOHN STARK.

